TP, rapid available phosphorus, organic content and rapid availableiron were gradually decreased in the top soil layer of wetland along the flow path.
总体而言，来水中的磷、有机质和速效铁以沿程逐渐降低的方式分布于湿地表层土壤中。
2
Trace elements fertilizer is rarely used in this region which leading to a decrease on the content of soil availableiron, available Manganese, and available copper.
当地农户施用微量元素肥料很少，造成土壤有效铁、有效锰和有效铜含量的下降。
3
He reasoned that iron took on more or less oxygen in response to conditions in the kimberlitic magma itself—mainly in response to heat and the available oxygen.